Having trouble starting my truck
About a month ago my truck starting having trouble starting.... whats been happening is It'll crank over for about 10-20 seconds before fireing. When it finally does it'll idle between 100 & 500 rmp for about 5 seconds & feels like it just wants to die. It's pretty freakin annoying.... I've changed the plugs & wires, could it be the coil? I'm guessing it's somewhere in the ignition system, but I just don't know where to go next..